Room 222 (drama, starring Lloyd Haynes)

[Before there was "Beverly Hills 90210" this high-school drama
was seen for five years on PrimeTime TV focusing on an idealistic
black history teacher in an integrated school; exteriors were
filmed at real-life Los Angeles High School; the youthful cast
portraying students included Michael Constantine, Denise Nicholas
and Karen Valentine]
(ABC Primetime, 1969 - 1974)